Out­stan­ding fea­tures of dif­fe­rent seri­es are the high safe­ty fac­tor of up to 6:1, that some swi­vel 360° and pivot 180°. Each hoist ring is heat trea­ted and 100% magne­tic par­ti­cle inspec­ted as well as 200% pro­of load tes­ted. In addi­ti­on they are tes­ted from inde­pen­dent labo­ra­to­ries and each hoist rings has its own seri­al num­ber for bet­ter tracea­bi­li­ty for safe­ty inspec­tions. The are­as whe­re hoist rings can be used is wide and inclu­des all indus­tries whe­re machi­nes, tools, dies, con­tai­ners and more have to be lifted for pro­duc­tion, moun­ting, or inspec­tion. A spe­cial hoist ring device is the paten­ted WKA-Sys­tem for the assem­bly of tower seg­ments of wind tur­bi­nes whe­re as who­le tower fami­lies from one or more manu­fac­tu­rers can be lifted and assem­bled with only 6 hois­ting points.